Abstract：Disadvantages of traditional direct torque control (DTC) systems for permanent magnet synchronous motors (PMSM) are high torque ripples and inconstant switching frequency at low speed. A novel DTC strategy of PMSM combined with exact duty ratio calculation is proposed based on the detailed analysis of effects factors of flux linkage and torque ripples. In this method the duty ratio between the action time of effective voltage vector and the sampling period is calculated according to torque errors based on exact mathematical models and the action time of active voltage vectors is adjusted. Simulation and experimental results show that the new DTC strategy based on duty ratio control has advantages of traditional DTC and effectively reduces torque ripples which improve the performance of traditional DTC.
徐艳平, 钟彦儒. 基于占空比控制的永磁同步电机新型直接转矩控制策略[J]. 电工技术学报, 2009, 24(10): 27-32.
Xu Yanping, Zhong Yanru. A Novel Direct Torque Control Strategy of Permanent MagnetSynchronous Motors Based on Duty Ratio Control. Transactions of China Electrotechnical Society, 2009, 24(10): 27-32.
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2009, Vol. 24 
